* {
    padding: 0;
    margin: 0;
    box-sizing: border-box;
}

/* 相同的样式 */

div {
    width: 100%;
    height: 150px;
    font-size: 50px;
    text-align: center;
    line-height: 150px;
}

.box1 {
    background-color: tomato;
    color: skyblue;
}

.box2 {
    background-color: aquamarine;
    color: #fff;
}

.box3 {
    background-color: skyblue;
    color: tomato;
}

.box4 {
    background-color: pink;
    color: blueviolet;
}

.box5 {
    background-color: #6cf;
    color: blueviolet;
}

.box6 {
    background-color: darkred;
    color: #fff;
}